v4.0.0

• Adds support for Mongoose v7.0.0 (@AanshSavla)
• When removing query operators, only remove keys starting with dollar sign (@binki)
• Updates all dependencies

3.0.0

• Added support for Mongoose 5.0
• Remove support for Node.js versions prior to 4.0

v2.0.0

• Return Promise when callback is not provided (#9)
• Fix post-upsert load when conditions no longer match (#10)

Thanks to @binki for his contributions!

v1.0.1

• Fix '$' key value pair removal (#7)

Thanks @tdharris!

v1.0.0

• Never consider /$/ as valid value for saving